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Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Business Combinations [Abstract] |  |  |  |
Revenues | $ 2,656,348 | $ 2,323,996 | $ 5,077,992 | $ 4,627,463
Gross profit | 333,371 | 334,454 | 636,226 | 633,461
Selling, general and administrative expenses | 206,104 | 208,437 | 422,537 | 415,863
Amortization of intangible assets | 10,507 | 10,740 | 21,168 | 21,665
Net income | 74,706 | 66,371 | 113,610 | 116,797
Net income attributable to common stock | $ 74,365 | $ 65,848 | $ 112,272 | $ 116,101
Earnings per share attributable to common stock: basic (in usd per share) | $ 0.49 | $ 0.42 | $ 0.72 | $ 0.73
Earnings per share attributable to common stock: diluted (in usd per share) | $ 0.48 | $ 0.41 | $ 0.72 | $ 0.73

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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